fix(任务中心): 权限判定调整

--bug=1047921 --user=白奇 无用例执行任务查询权限-有系统后台任务查询权限 https://www.tapd.cn/55049933/s/1597709

frontend/src/views/taskCenter/index.vue

@@ -99,7 +99,12 @@
   );
 
   onBeforeMount(async () => {
-    activeTab.value = (await getItem('taskCenterActiveTab')) || TaskCenterEnum.CASE;
+    const localTab = await getItem('taskCenterActiveTab');
+    if (tabList.value.some((e) => e.value === localTab)) {
+      activeTab.value = (localTab as TaskCenterEnum) || TaskCenterEnum.CASE;
+    } else {
+      activeTab.value = tabList.value[0].value;
+    }
   });
 </script>